An MDE Tool for Defining Software Product Families with Explicit Variation Points Simone Di Cola, Kung-Kiu Lau, Cuong Tran, and Chen Qian School of Computer Science The University of Manchester Oxford Road, M13 9PL, United Kingdom dicolas,kung-kiu,ctran,cq@cs.man.ac.uk Abstract: Current software product line engineering tools mainly fo- cus on variability in the problem space, and create product families by linking variability models to artefacts in the so- lution space. In this paper, we present a tool that can be used to define software architectures with explicit variation points, and hence product families, directly in the solution space.